The Chaosium was founded by visionary game designer Greg Stafford in 1975. For more than forty years, Chaosium has captivated gamers, readers and mythic adventurers worldwide. Its award-winning roleplaying games, boardgames and fiction have been acclaimed as some of the most engaging and innovative of all time.

The roleplaying games RuneQuest, Call of Cthulhu, King Arthur Pendragon, HeroQuest – as well as such classic board and card games as White Bear & Red Moon (later called Dragon Pass), Nomad Gods, Arkham Horror, Credo, and Mythos all originated at Chaosium.

Many of Chaosium’s product lines are based upon literary sources. Most notably, H.P. Lovecraft’s 1920’s horror fiction provides the basis of Sandy Petersen’s classic Call of Cthulhu roleplaying game line. The Lovecraft Cthulhu Mythos also provides the inspiration for many of the books in our Chaosium Fiction line.

We also publish Basic Role Playing (BRP), the core of our roleplaying game systems, and the first to use skills based upon the d100 mechanic. Call of Cthulhu, RuneQuest and most of our other RPG lines use BRP as the basis of their rules. Once you’ve learned to play one of these, you've learned to play the others.

Science is an Illusion, History is a Lie.
In ages past you lived many times. Your slaves built the Great Pyramid to honor your death; you died for the sins of Jerusalem; you lost your head suggesting they eat cake.
You are Nephilim – demi-god, prophet, saint, & magician from the mythic past.
Again you incarnate, to continue your ancient struggle for enlightenment,... [click here for more]

SECRET AGENTS from all over the world are converging, clandestinely, on a small science fiction convention. Coded transmissions have been intercepted, emanating from somewhere near the Con Suite. Fans have mysteriously disappeared, and stangers have shown up at the convention wearing their badges. And the rumor has it that some of these clever costumes aren't really costumes at all.
Live Action Roleplaying... [click here for more]

Anything you can imagine, you can play...
HeroQuest is the innovative, dynamic, and flexible rules engine by Robin Laws, suitable for play in any genre or setting. It present a simple and flexible system that allows Game Masters to make decisions the way authors and screenwriters do when creating novels, TV episodes and movies. HeroQuest encourages creative input from your players, resulting... [click here for more]